Mask



FIG. 1 is a perspective view of a first embodiment of a mask;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view thereof with a gasket and a filter detached from a face engaging portion of the mask;

FIG. 9 is a perspective view of a second embodiment of the mask;

FIG. 10 is a front view of the mask of FIG. 9 ;

FIG. 11 is a rear view of the mask of FIG. 9 ;

FIG. 12 is a right side view of the mask of FIG. 9 ;

FIG. 13 is a left side view of the mask of FIG. 9 ;

FIG. 14 is a top view of the mask of FIG. 9 ;

FIG. 15 is a bottom view of the mask of FIG. 9 ; and,

FIG. 16 is a perspective view of the mask of FIG. 9 with a gasket detached from a face engaging portion of the mask.

The broken lines shown in the drawings illustrate portions of the mask and form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 